JPS621618A - Heating device for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to finely control the temperature of blow-out air in a vehicle heating device incorporating a combustion type heater, by connecting a hot air relieving exhaust duct as a branch duct to a hot air generating duct in which the combustion type heater is incorporated, and by disposing a shut-off damper in this duct. CONSTITUTION:A common inlet port (a) for air to be air-conditioned, having a duct structure in which a hot air generating duct 1 incorporating a combustion type heater and a cooling air duct 2 are arranged in parallel, is connected to the discharge port of a blower casing 19 having its suction port connected with an inside and outside air change-over box 18. Both ducts 1, 2 are merged together on the downstream side thereof at a merging section (b) which is connected to an air blow-out port 7 for air-conditioned air through a cooling and hot air mixing chamber 6. Further, exhaust ducts 8, 9 are branched off from the ducts 1, 2, respectively downstream of the merging section (b), and exhaust duct shut-off dampers 13, 14 are disposed at the branch-off ports 11, 12 of the ducts 8, 9. By adjusting the opening degree of these dampers 13, 14, the temperature of the blow-out port for air-conditioned air may be finely controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heavy-duty heating device with a built-in combustion heater that has an improved method of controlling the temperature of the blown air.

[Prior Art] The conventional method for heating the interior of an automobile is to circulate and supply engine cooling hot water to a heat exchanger for generating hot air, which is called a heater core in the industry, but the thermal efficiency of the engine is In the case of expensive diesel engines, especially small diesel engines with fuel direct injection and high-efficiency gasoline engines that are becoming popular these days, it is not uncommon for heating capacity to be insufficient in severe cold weather, so combustion type engines are used as an auxiliary heat supply source. A method has been proposed in which a heater is used to heat engine cooling water or air to be conditioned.

[Problems to be Solved by the Invention] Conventional vehicle heating systems incorporating a heat exchanger of the type that heats conditioned air using a combustion type heater as described above do not use a heater as a method of controlling the temperature of the blown air. However, it was almost impossible to quickly and precisely adjust the temperature of the air blown from the device to a desired temperature. An object of the present invention is to provide a heating device for a vehicle that can quickly and precisely control the temperature of blown air by means of a heating device.

Means for Solving Problems] In order to achieve the above-mentioned object distantly, a vehicle heating device according to the present invention includes: a hot air generation duct incorporating a combustion type heater; a cold air blowing duct; A blower for introducing conditioned air into both ducts, a cold/warm air mixing chamber connected to the upstream confluence of the two ducts, and a conditioned air outlet connected to the downstream side of the mixing chamber; The V air duct is branched on the upstream side of the mixed flow section of at least one of the two ducts, and a damper for opening and closing the exhaust duct, and the opening degree of the damper for opening and closing the exhaust duct is A configuration is adopted in which the temperature of the conditioned air outlet is controlled by adjusting the temperature of the air conditioned air outlet.

[Operation 1] In the vehicle heating system with the above configuration, when the combustion heater is activated and the blower is activated, conditioned air is introduced from each air population of the two air conditioning ducts, Warmed air is blown out from the outlet of the hot air generation duct in which the combustion type heater is incorporated, and unheated air is blown out from the outlet of the cold air blowing duct, both of which flow into the cold and hot air mixing chamber. The overheated air is cooled down to an appropriate temperature by the cold air, and then blown out from the conditioned air outlet into the vehicle interior.

Since it is difficult to arbitrarily control the degree of heating of the conditioned air by the combustion type heater due to the structure of the heater, special means for controlling the temperature of the blown air is required. Therefore, in the vehicle cooling system of the present invention, when the temperature of the blown air is too high, the damper of the exhaust duct attached to one of the air conditioning ducts in which the combustion type heater is installed is opened appropriately to blow out the hot air. Escape the body to the outside world1. Then, if necessary, the exhaust duct damper of the other air conditioning duct is closed, and f! flows into the cold/hot air mixing chamber. Adjust the ratio of wind and cold air so that there is a relatively large amount of cold air. When the feeling of warmth is insufficient, by opening the damper in the opposite manner to the above, the amount of hot air blown into the cold/hot air mixing chamber becomes relatively large, and in the end, the heat generated by the combustion heater remains unchanged. Even if the temperature of the blown air is 3°, a desired temperature of the blown air can be obtained by appropriately opening and closing the above-mentioned dampers.[Embodiment 1] The structure of the present invention will be specifically explained below based on an embodiment shown in the accompanying drawings.

FIG. 1 is a side sectional sketch of a first embodiment of the device according to the present invention. 1 is a hot JjaJI raw duct with a built-in combustion type heater, 2 is a cold air blowing duct without a built-in combustion type heater, and a is a duct shared by two ducts 1 and 2 arranged in parallel. Conditioned air inlet, b is the downstream confluence of both ducts, 3 is an indirect heating combustion type heater for generating warm air, 40 and 41 are ducts for combustion air and combustion exhaust gas, respectively, 19 is the air population a Connected blower casings, 4 is a blower, 5 is a part of the blower, 18 is a blower casing, 1 is an internal/external air switching box connected to the intake port of the casing 19,
5 is an outside air inlet, 16 is an inside air inlet, and 17 is an inside/outside air switching damper.

Reference numeral 6 denotes a cold/hot air mixing chamber connected to the merging section, and 7 an air-conditioned air outlet connected to the downstream side of the mixing chamber, which opens toward the interior of the vehicle. 8 and 9 are exhaust ducts branched on the upstream side of the confluence of two ducts 1 and 2 for hot air generation and cold air blowing, 10 is an exhaust port, and 11 and 12 are branches of both ducts 8 and 9. Ports 13 and 14 are exhaust duct opening/closing dampers provided at branch ports 11 and 12, respectively. Further, 50 is an operation control device for the combustion type heater 3, and 51 is an in-vehicle battery power source.

FIG. 2 is a side sectional view of the combustion type heater 3, in which 30 is a heater housing made of a metal cylinder, 30a is an air outlet to be conditioned to the housing 30, 30b is a heated air outlet, 3
Reference numeral 1 denotes a combustion tube coaxially incorporated approximately in the middle of the housing 30, 32 a fuel supply nozzle for light oil, etc., 33 a glow plug for fuel ignition, 34 a combustion flame spout, and 35 the rear of the combustion tube 31. The heat exchange cylinder d connected to the end is a cylindrical heat exchange air passage formed between the heater housing 30, the combustion cylinder 31, and the heat exchange cylinder 35. 38 is a double-shaft motor; 36 is a fan fitted on one output shaft for intake of conditioned air; 37 is a fan fitted on the other output shaft for intake of combustion air; 39 is a motor casing;
40 is a combustion air supply duct connected to the motor casing 39; 41 is a υ1 gas duct connected to the heat exchanger cylinder 35; 42 is a combustion air jetting nozzle;
The operation of the combustion type heater 3 is obvious from a glance at FIG. 2, so a description thereof will be omitted.

Next, the operation of the above embodiment device will be explained.

First, when starting heating, the power switch (not shown) of the control device 50 is turned on to start the combustion heater 3 and at the same time, the blower motor 5 is energized so that the air to be conditioned is sucked in from the outside air inlet 15 or the inside air inlet 16. , is distributed and introduced into both air conditioning ducts from the common air population a of the two air conditioning ducts 1 and 2. The air flowing into the duct 1 is heated to a temperature higher than the desired blowout air temperature while passing through the heat exchange air passage d of the combustion heater 3 interposed in the flow passage, and then heads toward the confluence section. The air that has flowed into the duct 2 passes through the duct as it is, reaches the confluence section without being heated, where it merges with the humidified air, and is blown into the cold/hot air mixing chamber 6 for uniformly mixing both types of air. .

The too warm air that has flowed into the mixing chamber 6 is diluted by the cold air and reaches a temperature of 11 degrees, which is then released into the vehicle interior from the conditioned air blowing lower h. Although it can be controlled very roughly, it lacks a precise temperature control function due to its structure, so unless a separate auxiliary temperature control means is provided, it will not be possible to obtain comfortable air conditioning conditions. Therefore, after operating the control device 50 and adjusting the heat generation capacity J of the combustion heater 3 to a very low level such as two-stage switching between strong combustion and weak combustion, if the inside of the vehicle is too warm, 1 for discharging a portion of the warm air blown from the duct 1 to the outside of the vehicle from the terminal exhaust port 10 of the exhaust duct 8 by rotating the opening/closing damper 13 of the exhaust duct 8 attached to the duct 1 in the opening direction; At this time, if the opening/closing damper 14 of the υ1 air duct 9 branching from the cold air blowing duct 2 is in the rotating position in the opening direction, by operating this damper 14 in the closing direction, the By sending the cold air that has been blown outside the city through the duct 9 into the mixing chamber 6, the outlet air temperature can be further lowered to a degree corresponding to the rotation angle of the damper 13. 1 Also, when the feeling of warmth in the vehicle interior is insufficient, contrary to the above, the damper 13 on the hot air generation duct 1 side is rotated in the closing direction, and the damper 14 on the cold air blowing duct 2 side is rotated in the opening direction. The humidity of the blown air can be quickly and precisely adjusted to the desired humidity.

The rotary operation of the dampers 13 and 14 is performed using a remote control mechanism similar to the temperature control lever for manual adjustment of the temperature of the blown air built into a conventional automobile air conditioner.
All you have to do is move the W4 Onta knob or dial attached to the instrument panel. In order to avoid the trouble of individually operating the respective knobs for both dampers 13 and 14, it is necessary to establish a correlation between the respective rotational positions of both dampers 13 and 14 and the conditioned air blowing lagoon. Both dampers 1 were designed based on data obtained experimentally in advance.
It is sufficient to incorporate link mechanisms 3 and 14 for interlocking.

As for the opening location of the exhaust ports 10 of the exhaust ducts 8 and 9, since the installation location of the hot air generation duct 1 is generally in the engine room, it is located in this 1 engine room. Various effects can be obtained by heating the room.

The exhaust rod bar 13 attached to the hot air generation duct 1 not only plays the role of adjusting the temperature of the conditioned air blown out from the blowout lower, but also plays the role of scavenging the air inside the duct 1 when the combustion heater 3 is started or after it has stopped. Furthermore, by keeping the damper 13 fully open, it is possible to significantly reduce the degree to which scavenging cold air blows into the vehicle interior. .

In the device of the present invention, the cold air blowing duct 2 not only functions as a mere cold air passage, but can also be used to improve the air conditioning performance of the device. It is a schematic side sectional view, and 21 is a heater core 3 as a hot water type heater incorporated in the cold air blowing duct 2 in the above-mentioned first embodiment device. Hot water for use is sent through pipes 22 and 23 for circulation supply of dry water. 2
4 is a water valve for adjusting the amount of heat supplied to the heater core 21, and is remotely operated via a solenoid or a negative pressure actuator. 25 is an outside air temperature sensor, 26 is an outlet air temperature sensor, and 27 is a negative pressure actuator for opening and closing the damper 13. Other symbols in the figure are the same as those described above.

This device incorporates two heaters for generating hot air: a heater core 21 as a main heater and a combustion type heater 3 as an auxiliary heater. It is activated only when the heating capacity of the heater core 21 is insufficient. The operation of the combustion heater 3 is turned on and off by issuing an operation-on instruction to the control device 50 when the outside air temperature sensor 25 or the outlet air temperature sensor 2G detects a temperature below a set level. In addition, as a method of controlling the outlet air temperature when the main heater and the auxiliary heater are used together, the water valve 24 is kept fully open, and the exhaust duct damper 8 is operated by the negative pressure actuator 27 based on information from the temperature sensor 26. The opening degree may be adjusted through the opening. Further, in addition to the heater core 21, an evaporator as a heat exchanger for generating cold air may be incorporated into the cold air blowing duct 2.

[Effects of the Invention] The device of the present invention having the above-mentioned configuration is a combustion type heater that can only roughly adjust the amount of heat generated or lacks a means for adjusting the amount of heat that has been incorporated in conventional vehicle heating devices. Although the same type of heater is used, the hot air generation duct in which this combustion type heater is installed is provided with a branched exhaust duct for releasing the generated mff1, and a separate exhaust duct is installed for opening and closing this duct. By simply adding a very simple auxiliary mechanism, such as opening and closing a few dampers, the temperature of the air blown into the vehicle interior can be controlled very easily and quickly with sufficient precision by opening and closing the dampers.

[Brief explanation of the drawing]

FIG. 1 is a schematic side sectional view of a first embodiment of the device according to the present invention, and FIG. 2 is a side sectional view of a combustion type heater incorporated in the device shown in FIG. FIG. 3 is a schematic side sectional view of the device of the second embodiment.

Claims (1)

[Scope of Claims] 1) A duct for generating hot air incorporating a combustion type heater, a duct for blowing out cold air, a blower for introducing conditioned air into both the ducts, and a downstream confluence of the two ducts. a cold/warm air mixing chamber connected to the mixing chamber; an air-conditioned air outlet connected to the downstream side of the mixing chamber; and at least one of the two ducts branched on the upstream side of the confluence section. A vehicle heater comprising an exhaust duct and a damper for opening and closing the exhaust duct, and controlling the temperature of the conditioned air outlet by adjusting the degree of opening of the damper for opening and closing the exhaust duct. Device. 2) The vehicle heating device according to claim 1, wherein a hot water type heater as an auxiliary heat exchanger for generating hot air is incorporated in the cold air blowing duct. 3) The vehicle heating device according to claim 1 or 2, wherein an evaporator as a cooling heat exchanger is incorporated in the cold air blowing duct.